真空充(chong)(chong)氣(qi)(qi)(qi)(qi)包裝在真空后(hou)再充(chong)(chong)入氮(dan)氣(qi)(qi)(qi)(qi)、二(er)氧(yang)化碳(tan)(tan)、氧(yang)氣(qi)(qi)(qi)(qi)單一氣(qi)(qi)(qi)(qi)體(ti)或二(er)、三種(zhong)氣(qi)(qi)(qi)(qi)體(ti)的混合氣(qi)(qi)(qi)(qi)體(ti)。其氮(dan)氣(qi)(qi)(qi)(qi)是惰(duo)性(xing)氣(qi)(qi)(qi)(qi)體(ti),起充(chong)(chong)填作用,使(shi)袋內(nei)(nei)保持正壓,以防止袋外空氣(qi)(qi)(qi)(qi)進入袋內(nei)(nei),對食品起到一個保護作用。其二(er)氧(yang)化碳(tan)(tan)能夠(gou)溶(rong)于各類(lei)脂(zhi)肪或水,引成酸性(xing)較弱的碳(tan)(tan)酸,有(you)抑制霉菌、腐敗細(xi)菌等微生物的活性(xing)。其氧(yang)氣(qi)(qi)(qi)(qi)具有(you)抑制厭氧(yang)菌的生長繁殖,保持水果、蔬菜(cai)的新鮮(xian)及色(se)彩,高濃度氧(yang)氣(qi)(qi)(qi)(qi)可(ke)使(shi)新鮮(xian)肉(rou)類(lei)保持其鮮(xian)紅色(se)。
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